in older version of Minecraft i was able to knockback players with snowball and with fishing rod... and i was able to push player... it was quite fun to play snow fight and now i cant 😞
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well i dont think this is a feature.. because this stuff worked but it stoped working until 1.3..

This is not a bug because the behaviour was purposefully changed. The game is meant to work this way now.
Sorry, but this is not a bug. Feature requests should be posted on the MC forums.